Casing for pneumatic tires



F. B. CARLISLE.

CASIIIG FOR PNEUMATIC TIRES.

APPLICATION FILED AUG. 2, 1919.

Eautented July 6, M2M..

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I/I//T/I/ESSES surface thereof, said cords l though particularly FRED B.CARLISLE, 0F ANDOVER,

MASSACHUSETTS, OF NEW YORK, N. Y

ICE.

ASSIGNOR TO JUSEPH IVI. GILBERT,

CASING son PNEUMATIC Trans.

To all @IJ/0m t may concern Be it known that I, Flinn B. UsnLisLn, acitizen of the United States, and a resident of Andover, county ofEssex, State of Massachusetts, have invented a certain new and usefulImprovement in Casings foi' neumatic Tires, of which the following is aspecification.

ly invention relates to casings forpneumatic tires and more particularlyto that type thereof which have become known as cord tires and whichinclude cord plies as part of their construction. The object of myinvention is to provide an improved splice at the ends of the coid plieswhereby a maximum resistance against separation or opening of the pliesat said splice isestablished and whereby the thickness of the plies atthe splice is caused to conform substantially to that of the rest ofsaid plies. My invention will be fully described hereinafter and the ifeatures of novelty will be pointed out in the appended claims.

For the purpose of illustrating the invention, I have shown the plies ascomprising composite bands composed of a. foundation of sheet rubber anda plurality of parallel, adjacent cords preferablyT being impregnated,coated or otherwise treated with rubber orfa rubber composition. It willbe understood that my invention, al-

adapted to be applied to composite bands constructed as set forth,

ymay beeiiciently utilized in connection with cord plies constructedotherwise than as suggested. In the accompanying drawings, Figures l and2 are side and plan views `respectively illustrating diagrammatiballythe treatment of the coi'd plies to produce a splice according to myinvention; Fig. 3 is an edge view of the cord ply; Fig. 4 is aperspective view.diagranimatically illustrating the completed splice,and Fig. 5 is a dial grammatic view of the carcass.

As shown in the drawings, the plies com# prise composite bands 5 whichconsist of a group of parallel, adjacent cords 6 carried adhesivelyupon' one surface of a foundation 7 of sheet rubber in the form ofstrips having a width corresponding approximately to the-combined widthofthe group of cords 6. These composite bands 5 are spirally woundaround and between annular inenibersor rings 8 and completely cover theSpecification of `Letters Patent. Appiicanon 'med August 2, 191e.

carried. adbesively upon a' Patented J lily 6, 1920. Serial No. 314,930.

latter with cord plies to form a carcass as shown diagranimatically inFig 5 and which represents the` foundation from which the completedcasing is constructed. illustrated example the ends of the compositeband overlap to form a splice, which in the absence of any provision toavoid the same, ivouldincrease the thickness of the plies twofoldLat thesplice and thus would destroy the unifonity of the carcass as tothickness and evenness with the result thatharmful lstrains and stresseswould be developed in the finished casing during use.

As'a result the life be greatly reduced.

To overcome these disadvantages thel cords G are reduced in thickness bypressure at the opposite ends of the band 5 as indicated at 9, thecompression in some cases being in two stages to produce the step shapedends illustrated at 9 and l() in Fig. 3; itfwill, of course, beunderstood that a single compression such as 9 will, generally speaking,be preferred.

The pressure may be applied in any conrenient manner as by placing theends ofthe builds between suitable dies il and l2 operated in anysuitable manner by means of any well known typerof hydraulic or otherpress. The degree of pressure will be adapted to the reduction inthickness which is desired, a pressure of approximately 5000 pounds persquare inch having, in practice, been found satisfactory to produce thepoi'- tion S) vwhile a pressure of approximately QFD() pounds hassatisfactorily produced the portions IOIif the step shaped arrangementis used. As shown in `Fig. 4 the flattened ends of the band 5 overlapeach other to form a splice, tlie,arrangement preferably being such thatthe overlap takes place in registry with one of the annular members 8and forms a splice which is of approximately the same thickness theremainder of the band. thus substantially maintained in the carcass,such slight differences between the splice and the remainder of the bandas may occur being compensated for in any convenient manner, as forinstance by laying suitable strips of fabric over the edges of thecarcass, between, but not over the splices as indicated diagrammaticallyin Fig. 5.

and usefulness of the casing would be materially curtailed and itsvetliciency from a structural standpoint would` The uniformity of surfaceis By constructing the band as described and by overlapping the same inthe manner indicated, a splice is secured whereby a maximum ofresistance against separation or opening of the cord plies at the spliceis established. In other words, the splice is as strong as any otherpart of the band and develops no weakness Wherebythe eiiciencty7 andlife ofthe casing may be injuriously a fected.

Various changs in the specc shown and described may be made within thescope ofthe claims without departing Jfrom the spirit of my invention. i

I claim: y

the cornbination of a pair of annular members and a plurality ofparallel, adjacent cords constituting aI band vextending between andabout said annular members'm helical win ings and having its endsoverlapping to form one of said ends being a sphce, at least f flattenedat said splice.

2. In a casing for pneumatic tires the combinationfot1 a pair of annularmembers and 25 a composite band comprising a rubber sheet ycarryingadhesively upon its surface a group of parallel adjacent cords,helically Wound around and between said anL nular members and having itsends overlaping to form a splice, cords at said ends be@ i1n flattenedto compensate for the double" thlckness of the splice. 8. A band.omaterial for use in constructformt ing tires and including a pluralityof: parallel, adjacent cords having at least one en flatltened andadapted to overlap the other en J i 4, A. band of material for use inconstructing tires and com rising a rubber sheet and 40 a group of paralel, adjacent cords adhef sively carried by said rubber sheet upon itsone surface, the ends of said cords being d attened and adapted tooverlap each other.

In testimony whereof I have hereunto set my hand e "FRED B; CARLISLE;

said band being

